## PSN-L Email List Message

**
Subject: Re: Period extension**

From: Bob Smither Bob@...........

Date: Mon, 24 Sep 2012 22:10:15 -0500

I have posted some simulations of an overdamped geophone. The phone is
modeled after a Vinci VT32 - a typical 10Hz geophone.
The simulations are posted here:
http://www.c-c-i.com/2.3412358971118/
The simulations cover responses with the following values of damping:
damping load resistor
=====================================
..316 natural open circuit
..7 critical 1000 ohms
1. over 391 ohms
2. over -75.9 ohms
5. over -280 ohms
10. over -339 ohms
20. over -368 ohms
50. over -382 ohms
100. over -390 ohms
For each value of damping there are four plots - the frequency and step
responses at the phone output and the frequency and step responses at
the output of an ideal integrator (tau = 1 second) that corrects the
Lippmann response back to velocity.
The plots are listed in order of the above damping sequence on the web
page.
The simulations are built with ideal elements. I am working on, and
will post, simulations using op-amp models which will include noise
calculations for the circuits.
Best regards,
==================================================================
Bob Smither Bob@...........
"We make money the old fashioned way. We print it."
--Art Rolnick, Chief Economist, Minnepolis Federal Reserve Bank
==================================================================
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